I thought the ram was a distraction, basically. Manned by cannon fodder, the ram would draw the Etruscans to the gate while Myra and company scaled the walls elsewhere to wreck shit and sneak up on the gatehouse. Then the gates would be open so Claes can do her stuff.

EDIT: You know what? It's cool. I'll adjust the orders Thond gave Myra to better reflect this new idea. The southern edge of Lyvresse is still a good place for the penal battalions and the Forlorn Hope to rest up, wait for orders, and prepare for the assault.